java阻塞队列使用实例

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package threadpool;import java.util.concurrent.BlockingQueue;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.LinkedBlockingDeque;import java.util.concurrent.atomic.AtomicInteger;/** * Created by jl on 2016/10/17. * 测试阻塞队列的使用（模拟有200个文件需要处理，由一个读线程去将文件加载到容量为100的阻塞队列，由四个写线程去进行文件处理） */public class TestBlockingQueue {    // 能容纳100个文件    static final BlockingQueue<String> queue = new LinkedBlockingDeque<>(100);    //读个数    static final AtomicInteger rc = new AtomicInteger();    //写个数    static final AtomicInteger wc = new AtomicInteger();    static long randomTime() {        return (long) (Math.random() * 1000);    }    private static void scanFile(String name) {        try {            for (int i = 0; i < 200; i++) {                queue.put("file" + i);            }            queue.put("");//放置结束标置        } catch (InterruptedException e) {            e.printStackTrace();        }    }    private static void writeFile() {        while (true) {            try {                Thread.sleep(randomTime());                int index = wc.incrementAndGet();                String name = queue.take();                System.out.println(Thread.currentThread() + "=》" + name + "写操作完成，已完成：" + index);                //队列已经无对象                if ("".equals(name)) {                    // 再次添加”标志”，以让其他线程正常退出                    queue.put("");                    break;                }            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    public static void main(String[] args) {        //线程池        final ExecutorService exec = Executors.newFixedThreadPool(5);        Runnable read = new Runnable() {            @Override            public void run() {                scanFile("noNeed");            }        };        Runnable write = new Runnable() {            @Override            public void run() {                writeFile();            }        };        //从线程池起一个读线程        exec.submit(read);        //从线程池起四个写线程        for (int i = 0; i < 4; i++) {            exec.submit(write);        }        exec.shutdown();    }}
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